Electrically operated vacuum refrigerating plant



y 1940- w. VON SAUER 2,200,138

ELECTRICALLY OPERATED VACUUM REFRIGERATING PLANT Filed Aug. 30, 1958 CONDENSER CONDE/VSf/P WA TE PUMP Waiter V n 5 1 Patented May 7, 1940 ELECTRICALLY OPERATED VACUiIM REFRIGERATING PLANT Walter von Sauer, Berlin, Germany Application August 30, 1938, Serial No. 227,573 In Germany September 1, 1937 1 Claim. (Cl. 62152) So-called vacuum refrigerating installations times of peak loading by means of steam which are known, the action of which is based upon the has been generated electrically at the time of physical fact that a liquid, usually water, evapelectric motor drive. In this way the electric crates in a vacuum at a temperature that lies power station is put in a position to provide the 5 below its boiling temperature at atmospheric energy requisite for operating such installations 5 pressure. The heat of evaporation is then withat considerably cheaper prices, and the disaddrawn from the surroundings of the vacuum vesvantage inherent in steam ejectors of greater consel, or, if the vessel is insulated, from the liquid sumption of cooling water is on the one hand itself. restricted to the comparatively short times of The production-and maintenance of the 'vacpeak loading, and is on the other hand still fur- 10 uum in such installations has hitherto been efther set oil by the fact that the steam has been fected by means of a steam ejector or else by a generated with cheap current. motor-driven pump. Steam ejectors have the The invention is diagrammatically illustrated disadvantage that they develop a disproportionby way of example in the accompanying drawately large demand for cooling water, so that ing, in which a is the vacuum vessel of an electhey are not economical to operate unless the trically operated vacuum refrigerating plant, b is cooling water can be obtained from a well of a pump for evacuating the said vessel, c is an ones own. On the other hand they have the electric motor for driving the pump b, d is a advantage that they can be operated either with steam ejector for evacuating the vacuum vessel 0,

any available exhaust steam, or else with such e is a. switch for opening and closing the supply no steam as can be electrically generated comparacircuit to the pump b and an electrically heated tively cheaply at times of low load on the electric steam generator ,1, and g is a storage vessel for the power station or on its distributing plant. steam generated therein. Steam for operating Refrigerating installations the vacuum of the'ejector dis supplied from the storage vessel 0 which is produced by means of an electric motor by means of a pipe h. a have the advantage of a considerably smaller Aparticularly advantageous application of the demand for cooling water, but they have the disinvention is constituted by the so-called climate advantage of a considerable demand for current, installations, in which the cold produced is used which from an economic point of view is more in summer for cooling the air; for here the steam noticeable, as the prices of current that can be boilers that serve during the summer for producaccorded by the supply concern cannot be reing a steam jet are utilised in winter for heating. duced below a certain limit if the plant is also I What I claim is: used at the time of peak loading oi the electric In a vacuum operated refrigerating plant, a power station and of its distributing system, as vacuum vessel, main electrically operable means is in general unavoidable. for evacuating the vacuum vessel, electrical 3 Now according to this invention the advantages means operable during the operation of said first of vacuum cooling plants operated by electric momentioned means for generating steam, means for tors and those operated by means of steam ejecstoring the steam so generated, auxiliary means tors are fully utilised, without incurring the disfor supplementing said main evacuating means '40 advantages of either, by operating the plant durconnected to said storage means and associated 0 ing the times of low load on the electric power with said first mentioned evacuating means. station by means of an electric motor, and at WALTER. von BAUER. 

